WILCOX Robert, of Robert, dec., of South Kingstown, and Martha Potter, of William, of Richmond; m. by John Webster, Justice, Dec. 24, 1749; Richmond records.
Sylvester is mentioned in the 1807 will of William Willcox of SK. According to the will, Sylvester is son of Robert, William's brother.
Sylvester was a Revolutionary War soldier. Here is a summary from his Revolutionary War Pension File: On 3 Sep 1832 he personally appeared before the Court of Common Pleas in South Kingstown, Washington County; at that time he said he was age 73 and a resident of Exeter. He testified that he had served a little over two years in the Revolution [although not continuously]. He first joined early in Dec 1776. When the British fleet came there was an alarm and he was called up as a militiaman to guard the shore and quartered at Richard Gardiner's house. After that each half of the soldiers served during alternate months up until 1780. He was quartered part of the time at Robert Knowles' and part of the time at Silas Gardner's in Boston Neck and Benjamin Gardner's near the north ferry. He was on the island of Rhode Island [meaning Aquidneck Island] in Gen Sullivan's Expedition. After the British left he served two months on the island of Rhode Island part at Tomony Hill Fort [?] and part at Brenton's Neck. He served a total of two years and two months military service. He never had any written discharge; he has no record of his age. He was born in the town of Richmond, and has been living in South Kingstown since the war, until the spring of 1831 when he moved into Exeter where he now lives. (Rev War Pension File #S17797 Sylvester Willcox)
Sylvester Willcox is listed as a military pensioner age 84 in the Federal Census of 1840 at South Kingstown.